Referencing request from response (#238)

The best situation is to provide fixed values but sometimes you need to reference a request in your response. In order to do this you can profit from the fromRequest() method that allows you to reference a bunch of elements from the HTTP request. You can use the following options:

- `fromRequest().url()` - return the request URL
- `fromRequest().query(String key)` - return the first query parameter with a given name
- `fromRequest().query(String key, int index)` - return the nth query parameter with a given name
- `fromRequest().header(String key)` - return the first header with a given name
- `fromRequest().header(String key, int index)` - return the nth header with a given name
- `fromRequest().body()` - return the full request body
- `fromRequest().body(String jsonPath)` - return the element from the request that matches the JSON Path

fixes #237

samples/standalone/dsl/http-server/src/main/java/com/example/fraud/FraudDetectionController.java

@@ -1,5 +1,7 @@
 package com.example.fraud;
 
+import java.math.BigDecimal;
+
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -8,8 +10,6 @@ import com.example.fraud.model.FraudCheck;
 import com.example.fraud.model.FraudCheckResult;
 import com.example.fraud.model.FraudCheckStatus;
 
-import java.math.BigDecimal;
-
 import static org.springframework.web.bind.annotation.RequestMethod.PUT;
 
 @RestController

samples/standalone/dsl/http-server/src/main/java/com/example/fraud/FraudNameController.java

@@ -0,0 +1,73 @@
+package com.example.fraud;
+
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author Marcin Grzejszczak
+ */
+@RestController
+class FraudNameController {
+
+	private static final String FRAUD_SERVICE_JSON_VERSION_1 = "application/vnd.fraud.v1+json";
+
+	private final FraudVerifier fraudVerifier;
+
+	FraudNameController(FraudVerifier fraudVerifier) {
+		this.fraudVerifier = fraudVerifier;
+	}
+
+	@PutMapping(
+			value = "/frauds/name",
+			produces = FRAUD_SERVICE_JSON_VERSION_1)
+	public NameResponse checkByName(@RequestBody NameRequest request) {
+		boolean fraud = this.fraudVerifier.isFraudByName(request.getName());
+		if (fraud) {
+			return new NameResponse("Sorry " + request.getName() + " but you're a fraud");
+		}
+		return new NameResponse("Don't worry " + request.getName() + " you're not a fraud");
+	}
+}
+
+interface FraudVerifier {
+	boolean isFraudByName(String name);
+}
+
+class NameRequest {
+	private String name;
+
+	public NameRequest(String name) {
+		this.name = name;
+	}
+
+	public NameRequest() {
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+}
+
+class NameResponse {
+	private String result;
+
+	public NameResponse(String result) {
+		this.result = result;
+	}
+
+	public NameResponse() {
+	}
+
+	public String getResult() {
+		return this.result;
+	}
+
+	public void setResult(String result) {
+		this.result = result;
+	}
+}

samples/standalone/dsl/http-server/src/main/java/com/example/fraud/FraudStatsController.java

@@ -55,4 +55,3 @@ class Response {
 		this.count = count;
 	}
 }
-

samples/standalone/dsl/http-server/src/test/java/com/example/fraud/FraudBase.java

@@ -5,7 +5,6 @@ import org.junit.Before;
 import com.jayway.restassured.module.mockmvc.RestAssuredMockMvc;
 
 public class FraudBase {
-
 	@Before
 	public void setup() {
 		RestAssuredMockMvc.standaloneSetup(new FraudDetectionController(),

samples/standalone/dsl/http-server/src/test/java/com/example/fraud/FraudnameBase.java

@@ -0,0 +1,17 @@
+package com.example.fraud;
+
+import org.junit.Before;
+
+import com.jayway.restassured.module.mockmvc.RestAssuredMockMvc;
+
+public class FraudnameBase {
+
+	private static final String FRAUD_NAME = "fraud";
+
+	FraudVerifier fraudVerifier = FRAUD_NAME::equals;
+
+	@Before
+	public void setup() {
+		RestAssuredMockMvc.standaloneSetup(new FraudNameController(this.fraudVerifier));
+	}
+}

samples/standalone/dsl/http-server/src/test/resources/contracts/fraudname/shouldReturnAFraudForTheName.groovy

@@ -0,0 +1,25 @@
+package contracts.fraudname
+
+org.springframework.cloud.contract.spec.Contract.make {
+	request {
+		// highest priority
+		priority(1)
+		method PUT()
+		url '/frauds/name'
+		body([
+			   name: "fraud"
+		])
+		headers {
+			contentType("application/vnd.fraud.v1+json")
+		}
+	}
+	response {
+		status 200
+		body([
+				result: "Sorry ${fromRequest().body('$.name')} but you're a fraud"
+		])
+		headers {
+			header(contentType(), "${fromRequest().header(contentType())};charset=UTF-8")
+		}
+	}
+}

samples/standalone/dsl/http-server/src/test/resources/contracts/fraudname/shouldReturnNonFraudForTheName.groovy

@@ -0,0 +1,23 @@
+package contracts.fraudname
+
+org.springframework.cloud.contract.spec.Contract.make {
+	request {
+		method PUT()
+		url '/frauds/name'
+		body([
+			   name: $(anyAlphaUnicode())
+		])
+		headers {
+			contentType("application/vnd.fraud.v1+json")
+		}
+	}
+	response {
+		status 200
+		body([
+				result: "Don't worry ${fromRequest().body('$.name')} you're not a fraud"
+		])
+		headers {
+			header(contentType(), "${fromRequest().header(contentType())};charset=UTF-8")
+		}
+	}
+}